Paper - Normal development of early human embryos: Observation of 90 specimens at Carnegie stages 7 to 13

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Nishimura H. Tanimura T. Semba R. Uwabe C. Normal development of early human embryos: Observation of 90 specimens at Carnegie stages 7 to 13. (1974)Teratology 10(1): 1-5. PubMed 4853372

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This historic 1974 paper by Nishimura and colleagues describes human embryos from the Kyoto Collection.


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  Historic Papers: 1907 Somites 23 | 1914 | 1914 somites 27 | 1926 Somites 22 | 1926 Precervical Sinus | 1928 Somites 23 | 1937 Somites 25


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  Historic Papers: 1905 Embryo 148 | 1926 Precervical Sinus | 1945 | 1955



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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Normal Development of Early Human Embryos: Observation of 90 Specimens at Carnegie stages 7 to 13

Hideo Nishimura (1912–1995)
Hideo Nishimura (1912–1995)


Abstract

1. A systematic analysis of the relation between 2 parameters of developmental stage — clinically assessed embryonic age and growth — was made for 90 human embryos at Carnegie stages 7–13 from healthy pregnancies.

2. The data showed remarkable individual variation in the relation between age and developmental stage of embryos at stages 11–13. It appears that the mean age for these stages in our specimens was a few days greater than the corresponding age in the currently cited standards, although a definite conclusion must await further studies.

3. The relation between body length and developmental stages in our embryos was not different from the corresponding standards presented by previous investigators. The relation of the number of somites to developmental stage and greatest length in 13 embryos at stages 9–11 was approximately in accord with that reported for several corresponding embryos by other investigators.

4. The oldest age for embryos at each stage in our data may have practical use in denying a causal relation between the exposure of pregnant women to an exogenous agent at such a stage and the subsequent appearance of specific malformations in their progeny.


Week: 1 2 3 4 5 6 7 8
Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23



Cite this page: Hill, M.A. (2019, April 25) Embryology Paper - Normal development of early human embryos: Observation of 90 specimens at Carnegie stages 7 to 13. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Normal_development_of_early_human_embryos:_Observation_of_90_specimens_at_Carnegie_stages_7_to_13

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